Just took car to garage to replace parking sensor on front right but I bought the wrong 1, didn't know they were different. Typically, I bought a sensor thinking they were the same but apparently not. I need the 1 in the plastic trim on the wheel arch, but bought a bumper 1😠. The guy said they differ as there's a notch in the housing on the wheel arch 1, does anyone have a part number for this or know where I'd find it, tried googling but just comes up with parking sensor. Thank you.